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DIGITAL MONITORING RELAY UNBALANCE 0-20% REVERSIBLE PHASE SEQUENCE PHASE FAILURE 3X 160 TO 690V AC 50 TO 60 HZ UNDERVOLTAGE 160-690V HYSTERESIS 1-20V ON AND OFF DELAY 0-20S 2 CHANGEOVER CONTACTS SCREW TERMINAL REPLACEMENT PRODUCT FOR 3UG3012-1A...